What does the 10w40 oil grade mean?
1 Answers
Oil grade 10w40 refers to the viscosity of the oil being 10w40. The number before the 'w' represents the cold-start performance, with smaller numbers indicating easier engine starts in cold weather. Common grades include 0W, 5W, 10W, and 15W. The number 40 indicates the oil's viscosity characteristics at high temperatures, where higher viscosity oils may be more suitable for high-speed driving or heavy-duty vehicles. Relevant information about engine oil is as follows: 1. Engine oil, also known as motor lubricant, serves to lubricate and reduce friction in the engine, assist in cooling, prevent rust and corrosion, and provide shock absorption. 2. Engine oil consists of two parts: base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, while additives compensate for and improve any performance deficiencies.